Rotary printing press



" July 14, 1925.

R. GROSSKOPF ROTARY PRINTING PRESS Filed July 30, 1924 Patented July 14, 1925.

UNITED STATES RICHARD GROSSKOPF, or DRESDEN, GERMANY.

ROTARY PRINTING PRESS.

Applicatioirfiled July so, 1924. Serial No. 729,023,

To all whom it may concern:

Be it known that I, RICHARD Gnossnorr, citizen of the German Republic, residing in Dresden, Germany, have invented certain new and useful vlmprovements in Rotary Printing Presses, of which the following is a specification.

This invention relates to a device for safely throwing in and out of gear the intermittently rotated pressure rolls of rotary printing presses.

The pressure roll of rotary printing presses must be protected from smudging and must therefore very often be immediately disengaged from the drive when the sheet of paper to be printed is fed into faulty or out-of-register position. The said roll is thrown out of gear by laterally shifting the toothed wheel (rigidly connected to the roll) out of its plane of engagement with the driving toothed wheel. The said roll however can be thrown in and out of gear only when stationary, the operation having to be completed before the intermittent-rotation-producing fingers secured to the toothed wheels come into co-operation, for the purpose of avoiding dangerous shocks and possible breakage in the machine. Thus the moment suitable for performing the engaging or disengaging operation had to be awaited hitherto by watching the sheet gripper.

The present invention entirely obviates these disadvantages and provides an indicator fitted to the printing press and actuated for example by the printing roll or by any constantly rotating shaft of the press, the hand of the indicator moving past a mark or sector when the engaging or disengaging operations may be safely performed.

A constructional example of the indicator according to the present invent-ion is illustrated in the accompanying drawings in which Figure 1 is a side elevation, partly in section on line G-D of Figure 2, (and therefore with operating lever removed) of a printing machine fitted with the said indicator, and

Figure 2 is a section thereof on line AB.

The flywheel shaft or carries the driving toothed wheel (1 adapted to mesh with a toothed wheel mounted on the shaft-b together with the printing roll I), for the wheel (Z, and with the aid of a recess d in the toothed wheel 0!, a cam disc f, and a snap or catch roller 9. The pressure roll 6 is thrown out of gear as described, that is to say by shifting it axially by means of the double-armed operating lever 71. moved in the required. direction, so that the toothed wheel d with the finger (Z moves out of mesh with the toothed wheel 0 with the finger 0 The pressure roll is thrown into engagement by moving the operating lever 71, in the opposite direction.

The time suitable for throwing the said pressure roll in and out of engagement is indicated by means of a mechanism comprising a toothed wheel 2' mounted on the shaft 6 and meshing with a parallel toothed wheel in with twice its periphery. The said wheel k carries a hand Z. A mark or sector m is disposed above the wheel is, so that the pressure roll may be safely thrown in or out of engagement while the hand Zmoves past the said mark or sector.

I claim 1. In a printing press, the combination with a printing couple comprising a constantly rotated form cylinder and an'intermittently rotated impression cylinder and manually operable means to put the impression cylinder out of commission during the rotation of the form cylinder, of an indicator dial, an indicator hand movable over the said dial, and means to move the indicatorhand over the dial bet-ween the intermittent rotary movements of the impression cylinder. I

2. In a printing press, a frame, a printing couple mounted thereon comprising a constantly rotated form cylinder and an intermittently rotated impression cylinder, manually operable means to put the impression cylinder out of commission during the rotation of the form cylinder, an indicator dial mounted on the frame and movable over said dial, and means operated by the form cylinder for moving the indicator hand over the dial between the intermittent rotary movements of the impression cylinder.

3. In a printing press, a frame, a constantly' rotated driveshaft; a form cylinder constantly rotated by the drive shaft, an impression cylinder intermittently rotated by the form cylinder, manually operable means to put the impression cylinder out of commission during the rotation 01"- the form cylinder, an indicator dial mounted on the frame, an indicator hand movable over the dial and means operable by a constantly rotating element of the press to move 10 the indicator hand over the dial between the intermittent rotary movements of the impression cylinder.

In testimony whereof I have: signed name to this specification in the of two subscribing Witnesses.

RICHARD GROSSKOPF.

YVitne sses M.- KERBER, NAN. VVINKLER.

y presence 

